Chaeles feedeeick geimmett and joseph cook



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G. F. GRIMMETT & J. COOK.

, DEVICE FOR MAKING GOILS, RINGS, AND SIMILAR ARTIGLES..

1%. 304,639. Patented Sept. 2,1884.

01- w i K l- I z E 65 H1 u M M lhvirs STATES PA ENT Ornicn.

CHARLES FREDERICK GRIMMETT AND JOSEPH COOK, OF BIRMINGHAM, COUNTY OF VVARWIOK, ENGLAND.

DEVICE FOR MAKING COILS, RINGS,'A ND SIMILAR ARTICLES.

SPECIFICATION forming part of Letters Patent No. 304,639, dated September 2 1884.

Application filed June 23,1884. (No model.) Ifatented in England April 8, 1882, No.1,694; in France October 1'3. 1582,}10. 151,352; in Belgium October 13, 1882, No. 50,279. and in Germany February 15, 1883, No. 1,930.

To all whom itma-y concern:

Be it known that we, CHARLES FREDERICK GRIMMETT and J osEPH 0001;, both of Birmingham, in the county of Varwick, England, subjects of Great Britain, have invented new and useful Improvements in Devices for Manufacturing Cornice Coils, Rings, and other Similar Articles, of which the following is a specification.

So that our invention may be fully understood, we will refer to the accompanying sheet of drawings and letters of reference marked thereon.

Like letters refer to similar parts throughout the drawings.

Figure 1 is an elevation of the flexible mandrel; Fig. 2, asection of same through the flexible part thereof. Fig. 3 is a longitudinal elevation of a lathe or other similar machine, showing the shaft with spinl groove cut on its surface. Fig. at is an end elevation of same, showing position of the flexible mandrel when in use. Fig. 5 is a section of the bell'shaped die for guiding the metal strip and holding the flexible mandrel in position.

In manufacturing by our devices cornice coils, rings, or other hollow spiral coils or rings we employ, in connection with a suit- The strip of brass or other metal U of which it is desired to construct the coils or rings is then drawn through the bellshaped dieR under the solid portion of the mandrel S. This operation causes the brass strip U to bend or wind around said mandrel, and thus it is drawn over the flexible portion S thereof into one of the grooves N, formed on the shaft N, which is shown with a tube or coil in the grooves extendingfrom n to n. This shaft N may be constructed round, oval, or of other desired shape, according to the form the coil or rings are required to be finished, and it may be either constructed withaspiral groove around its circumference or it may be formed plain, according to the strength and quality of the metal being used and other varying conditions. I

The flexible mandrel S, Fig. 1, is a most import-ant feature of our invention, because without ample flexibility the tube or other coil could not be. wound evenly on the shaft. We make our flexible mandrel S partly from a number of thin strips of metal, as shown at S" and in section in Fig. 2,which may be oval, round, or any other desired shape, according to the internal section of the tube required. The thin layers or other pieces as theybend round a shorter or longer curve adapt themselves in length by sliding upon the surfaces of one another, according to the bend of the mandrel, which will be regulated partly by the diameter of the coil required and partly by the thickness and strength of the metal to be coiled.

WVe are aware that strong metal strips can be coiled without our flexible mandrel, but the great advantage in the use of our mandrel is that it enables us to coil metal very much thinner than can otherwise be accomplished, the fact being that the curved mandrel delivers the tube onto the shaft sufficiently far to prevent it collapsing, and thus we are enabled to produce cornice-rings much lighter and cheaper than has been hitherto possible. After making a coil of hollow tube we run afine saw through the coils, which cuts them into split rings, which we'fasten together in any suitable known manner; or they may be left quite plain to twist aside over the cornicepole. These mandrcls are suitable for forming many other sections besides round and oval. Their range of usefulness is, indeed, very wide for making various articles requiring'similar treatment to that described above for making cornice coils and rings.

Having now described our invention of improreinents in devices for llliLllllfil/Glllllllg ('01)- .lm testimony that we claim the foregoing as [0 nice coils, rings, and other similar articles, our own \veztflix our signatures in thepresence What we claim is of two Witnesses. v i

1. The flexible mandrel S S, composed in CHARLES FREDERICK GRIMMETT. 5 part of a number OfSlllZLll sections of suitable JOSEPH 000K.

material, as herein set forth. Vitnesses:

2. A flexible mandrel in combination with GEORGE PRICE, a lathe and grooved shaft, N, substantially as Clerk to MW. George Barker. set forth. 1 GEORGE BARKER. 

